proper way to do a compression test.
#1
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proper way to do a compression test.
Sorry if this has been covered but I have heard people get into arguments many times over how many times to crank the ignition when doing a compression test. along with what fuses to pull, and ive even heard of people pulling the injectors. the motor has to be warm, thats a given but is there anything else?
#2
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Re: proper way to do a compression test. (DIRep972)
there is 2 ways you can do it. both are same theory but one is with the motor off and doing the compression off the starter a few times,
and the other is by starting the motor with 1 spark plug out and the compressor in there
the second one gives usually a better reading. Pulling the injectors isn't necessary since you have the compressor in there and running it for about 3 seconds at a time, but you will see the PSI on the gauge go up after about 4 strokes of the piston.
hth
and the other is by starting the motor with 1 spark plug out and the compressor in there
the second one gives usually a better reading. Pulling the injectors isn't necessary since you have the compressor in there and running it for about 3 seconds at a time, but you will see the PSI on the gauge go up after about 4 strokes of the piston.
hth
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Re: proper way to do a compression test. (poison)
that's weird cause i did the same things and i got ridiculously high numbers across each cyl (in the high 200's). I guess it's not bad though because it was even across the board. i might try it again today.
#5
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Re: proper way to do a compression test. (ichibanjap)
you keep cranking it until the PSI gauge doesn't go any higher, this determines the maximum PSI for compression.
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